Dyestuffs of the triarylmethane series



UNITED STATES PATENT OFFlCE DYESTUFFS OF THE TRIARYLNIETHANE SERIES Paul Herbert Wolff, Frankfort-on-the-Main- Hochst, Friedrich Heim, Sindlingen, and Carl Winter and Ludwig Bettag, Ludwigshafen-onthe Rhine, Germany, assignors to General Aniline Works, Inc., New York, N. Y., a corporation of Delaware No Drawing. Application September 15, 1937, Sgrial No. 163,960. In Germany September 28, 1 33 4 Claims. (Cl. 260319) The present invention relates to new dyestuffs ence of a condensing agent, for example an anof the triarylmethane series and a process of hydrousmetal halide such as zinc chloride or producing same. The present application is a aluminium chloride. The resulting basic dyecontinuation in part of our copending applicastuffs may be aftertreated with sulphonating tion Ser. No. 76,258, filed April 4, 1936. agents such as concentrated sulphuric acid. 5 We have found that new valuable dyestuffs The beta-beta-di-indolylketones serving as of the triarylmethane series having very favorstarting materials for the purpose of the present able properties as regards fastness, especially exinvention may be obtained from indoles substicellent fastness to light, are obtained by contuted in alpha-position, or from N- and alphadensing a beta-beta-di-indo1ylketone of the folsubstituted indoles by causing phosgene to act lowing formula thereon in the presence of benzene at room temperature or while slowly heating. The reaction Q --C-- products are stirred with dilute aqueous amp l monia and the beta-beta-di-indolylketones o f \X X/ f dried. Y y The secondary or tertiary diphenylamines employed in the present process must have a free wherein X represents a member the gmup -position but they may be substituted in the 4'- consisting of methyl and phenyl and Y represents a member of the group consisting of hydrogen and alkyl with a secondary or a tertiary diphenylamine of the following formula:

or aralkoxy groups.

The reaction proceeds for example according to the following equation:

wherein R1 represents a member selected from z +O ORt+PO G12 the group consisting of hydrogen, methyl, alkoxy tz and aralkoxy groups, R2 represents a member R of the group consisting of hydrogen and alkyl 1 and R3 represents a substituent of the group 0 consisting of methyl, alkoxy and aralkoxy groups. N

For the production of the said dyestufis the separated are filtered off by suction, washed and 1 position or also in the 3-position by alkyl, alkoxy 1 beta-beta-di-indolyl-ketone may at first be converted into a ketone chloride-like compound by means of phosphorus oxychloride, the said coml pound then being condensed with the diphenylc N R, amine giving the dyestuff. The two reactions a X may also be carried out in one working opera- Y R1 40 tion whereby the formation of the ketone chlo- --o ride-like compound of the beta-beta-di-indolylketone is effected in the presence of the secondary or tertiary diphenylamine. In this case I the formation of the dyestuff by the condensa- Y tion of the diphenylamine with the ketone chloh i X represents th l or phenyl, Y hydroride-like compound takes place in a speed degen or alkyl, R1 hydrogen, methyl, alkoxy and pending on the formation of the ketone chloridearalkoxy, R2 hydrogen or alkyl groups and R3 like compound. It is also possible to prepare the methyl, alkoxy or aralkoxy groups.

ketone chloride of the b t -be -d d y The sulphonated dyestuifs are well suitable ketone in a separate operation by causing phosfor dyeing wool and silk. The dyestuffs free gene to act on a suspension of the beta-beta'-difrom sulphonic groups may be used, for example, indolylketone in boiling benzene. The ketone for coloring cellulose ester lacquers.

chloride is then condensed with the secondary or The following examples will further illustrate tertiary diphenylamine preferably in the preshow our said invention may be carried out in practice but the invention is not restricted to these examples. The parts are by weight.

Example 1 A mixture of 44 parts of beta-beta'-di-(N- methyl-alpha-phenylindolyl)-ketone, 35 parts of tetrachlorethane and 16.4 parts of phosphorus oxychloride is stirred for an hour at G. Then 25.7 parts of 4,3'-diethoxydiphenylamine are added. The formation of the dyestuff is effected by heating the mixture at about C. for 20 hours. The melt is then treated with hot water and the tetrachlorethane is removed by steam distillation. The residue is stirred with xylene and the dyestuiT thus remaining is filtered ofi by suction and dried.

30 parts of the basic dyestufi thus obtained are then introduced while stirring into 100 parts of sulphuric acid of 90 per cent strength and then converted into the disulphonic acid by the addition of sulphuric acid monohydrate. The mixture is poured onto ice and the dyestuif separated is filtered off and dried. It dyes wool and silk blue shades of excellent fastness to light. The dyestuif corresponds to the formula:

Similar dyestuffs giving blue dyeings on wool and silk and having similar good fastness to light are obtained if instead of 4,3'-diethoxydiphenylamine 4-methoxy-3-ethoxydiphenylamine, 4- methyl-3'-benzylhydroxydiphenylamine or 4- benzylhydroxydiphenylamine are employed.

Example 2 A mixture of 44 parts of beta-beta-di(N methyl-alpha-phenylindolyl)-ketone, 44 parts of toluene, 22.7 parts of 4-methyl-3-ethoxydiphenylamine and 16.4 parts of phosphorus oxychloride is heated at 100 C. for 8 hours while stirring. After working up and sulphonating in the manner described in Example 1 a dyestuff is obtained which dyes wool and silk blue shades of excellent fastness to light. The shades are a little more reddish than those obtained with the dyestufi described in Example 1.

Example 3 Example 4 A mixture of 44 parts of beta-beta-di(N- methyl-alpha-phenylindolyl) -ketone, 44 parts of toluene, 22.7 parts of 4-ethoxy-3'-methy1diphenylamine and 16.4 parts of phosphorus oxychloride is stirred at about 100 C. for 24 hours.

After working up and sulphonating in the man-- ner described in Example 1 a dyestufi is obtained giving on wool and silk blue shades of excellent fastness to light.

Example 5 A mixture of 44 parts of beta-beta-di(methylalpha-phenylindolyl)-ketone, 44 parts of toluene, 22.7 parts of N-methyl-4ethoxydiphenylamine and 16.4 parts of phosphorus oxychloride is stirred at about 100 C. for 24 hours. After working up and converting it into its disulphonic acid in the manner described in Example 1 a dyestuff is obtained dyeing Wool and silk blue shades of excellent fastness to light.

Example 6 28.8 parts of beta-beta-di(alpha-methylindolyl) ketone, 28.8 parts of toluene, 22.7 parts of 4-methyl-3'-eth0xydiphenylamine and 16.4 parts of phosphorus oxychloride are stirred at about 100 C. for 24 hours. The melt is Worked up and converted into its disulphonic acid according to the manner described in Example 1. stuff obtained dyes wool and silk red-violet shades of excellent fastness to light.

By employing 4,3'-diethoxydiphenylamine instead of 4-methy1-3-ethoxydiphenylamine a red-violet dyestufi giving somewhat bluer shades and having similar fastness properties is obtained.

Example 7 A mixture of 40 parts of beta-beta'-di-(N- isobutyl-alpha-methylindolyl)-ketone, 40 parts of toluene, 25.7 parts of 4,3-diethoxydiphenylamine and 16.4 is stirred at about 100 C. for 24 hours. working up and sulphonating in the manner delent fastness to light. more reddish than that in Example 6.

A similar dyestuff having a red-violet shade and similar good properties is obtained if instead of beta-beta-di(N-isobutyl-alpha-methylindolyD-ketone beta-beta'-di(N-omega-cyanethyl-alpha-methylindolyl)-ketone is employed.

Example 8 A mixture of 31.6 parts of beta-beta'-di-(N- methyl-alpha-methylindolyl)-ketone, 31.6 parts of toluene, 25.7 parts of 4,3-diethoxydiphenylamine and 16.4 parts of phosphorus oxycholride is stirred at about 100 C. for 24 hours. The melt is Worked up and converted into its disulphonic acid in the manner described in Example 1. The dyestuff obtained dyes wool and silk red-violet shades of excellent fastness to light.

What We claim is:

1. The process of producing dyestuffs of the The shade is somewhat of the dyestuff described parts of phosphorus oxychloride a compound of the general formula wherein X represents a member of the group consisting of methyl and phenyl and Y represents a member of the group consisting of hydrogen and alkyl into the corresponding ketochloride by means of phosphorus oxychloride substantially in the absence of water and condensing the ketochloride formed with an aromatic amine of the general formula wherein X represents a member of the group consisting of methyl and phenyl and Y represents a member of the group consisting of hydrogen and alkyl by means of phosphorus oxychloride substantially in the absence of water with an aromatic amine of the general formula OsQ R 12 wherein R1 represents a member selected from the group consisting of hydrogen, methyl, alkoxy and aralkoxy groups, Re represents a member of the group consisting of hydrogen and alkyl and R3 represents a substituent of the group alkoxy and aralkoxy groups basic dyestuff by consisting of methyl, and sulphonating the resulting treatment with a sulphonating agent.

3. Sulphonation products of dyestuffs of the triarylmethane series corresponding to the general formula wherein each A represents an indolyl radicle, attached to the carbon atom in the beta-position, being substituted in the alpha-position by a substituent of the group consisting of methyl and phenyl and containing attached to the nitrogen atom a member of the group consisting of hydrogen and alkyl, and wherein B represents the radicle of a diphenylamine, attached to the carbon atom in the it-position, containing in the 3- position a member of the group consisting of hydrogen, methyl, alkoxy and aralkoxy groups and being substituted in the 4'-position by a substituent of the group consisting of methyl, alkoxy and aralkoxy groups.

4. Dyestuffs of the triarylmethane series corresponding to the general formula arty/ wherein X represents a member of the group consisting of methyl and phenyl and Y represents a member of the group consisting of hydrogen and alkyl and wherein R1 represents a member selected from the group consisting of hydrogen, methyl, alkoxy and aralkoxy groups, R2 represents a member of the group consisting of hydrogen and alkyl and R3 represents a substituent of the group consisting of methyl, alkoxy and aralkoxy groups.

PAUL HERBERT WOLFF. FRIEDRICH I-IEIM.

CARL WINTER. LUDWIG BET'I'AG. 

